Heating coil



Nov. 23 1926.

C. B. FOSTER HEATING COIL Filed sept. 26, 1924 o 6| ENTOR -l NV .6524. I y1] s n omg? nl N Patented Nov. Z3, 1925.

UNTED STATS CHARLES B. FOSTER, OF INDIANAEGLS, INDANA.

HEATING COIL.

Application led September 26, 1924. Serial No. 740,147.

This invention relates to heating coils or radiators.

Among the objects of this invention 1s the provision of a heating coil, adapted tothe usual methods of manufacture, as a cast iron coil, used in multiple, at the same time embodying certain advantageous' features forl overcoming defects in the well known types of coils now on the market.

In an attempt to increase the radiating area of some heating coils, a multiplicity o f hollow projections, from the body of the coil units, is resorted to, forming openings 1n the general inside cored surface of coils, which openings are curtained over by a dropping film of condensation water, which in a measure, cuts off communication between the main cavity of the coil and the cavities of the projections.

One of the objects of my invention is to provide such a construction of heating coil as well as give the maximum of radiating wall area in direct contact with the body of heating medium circulating within the coils.

Another object of such a construction is to afford no opportunity of cutting olif direct communication between parts of the radiating surfaces and the heating medium, affording better means for eliminating surface iilms of condensation.

A further object is to provide in a heating coil, a maximum of draining surface area to the radiating walls, at the same time affording ample means for drainage by the construction of the coils.

Ina construction of heating coils, affording extra radiating. area, by a multiplicity of projections, the air coming into contact with the coils becomespocketed between the projections, where they lie closely together and tends to prevent the free circulation of air, therefore, another object of my invention is to provide a construction of heating coil, the formation of the radiating surfacesl of which, when the coils are assembled, afford certain passages which cause the air to traverse a zig zag path, so that while permitting of a circulation of air through the assembled coils as a bank of the same, cause a mixing of the stratified layers of air, bringing all the air into contact with the radiating surfaces of the coils, increasing the radiating efficiency ofthe radiator.

A further object is to provide a heating coil construction fulfilling most of the above objects and leaving no water of condensation within to freeze when an unused radiator is exposed to cold weather.

W ith these and other objects, my inven. tion resides in certainconstruction, diiferent embodiments of which are illustrated in the drawings, is hereinafter described, the action of which is explained and what l claim is set forth.

In the drawings, l

Figure 1 is aside elevation of a bank of' heating coils embodying my invention.

Figure 2 is an end elevation of the bank of. coils shown in Figure 1. y

Figure 3 is a cross section of a coil unit.

Figure 4 is a longitudinal section taken on the line 4.-4 of Figure 3.

Figure 5 is an elevation of a heater,'.in` cluding` a bank of heating coils and a housing for causing air to pass three times through the said bank.

Figure 6 is a cross section taken on the line 6 6 of Figure 5.

Figure 7 is a cross section of one of' thev heatingcoils used in the bank of coils in the heater shown in Figures 5 and 6.

In the figures, the coil unit 1 is shown (see Figure 3) to have three hollow leaves 2, 3 and 4 projecting in one direction and two hollow longitudinal leaves-5 and 6 projecting' in the opposite direction. The eX- terior wall of leaves 5 and 2, and the eX- terior wall 8 of the leaves 6 and 4 are reversely curved, while the walls 9, of the leaves 5 and 6, and the walls 10 and 11, of the leaves 2, 3 and 4 are circularly curved. The main cavity 12, of the unit 1, opens into the five longitudinal pockets 13, 14, 15, 16 and 17, of the five respective leaves 2, 3, 4, 5 and 6. At each end of a coil unit are sockets 18 and'l') right and left threaded for the reception of nipples 20 which connect the units into a radiator bank 21, as shown 'in Figures 1 and 2.

rI he radiator bank 21 has a feed pipeV 22 and a drain pipe 23. besides a housing 24, provided with deflectors 25, the purpose'of which is hereinafter explained.

In Figures 5 and 6 is shown a bank of eighteen coils 26, having a housing 27, in which are compartments 28, 29, 3Q and 31. for the circulation of air. At the entrancev to the compartment28 is a form of shutter pipe 33 and a drain pipek 34. d .A typical section of each of the coils used 1n the bank 26, 1s shown inFigure 7, in

The radiator bank of coils 26 has a feedl which are six'unit-s 1, within a housing 35; Three channels 36 and six curved pieces 37 form deflectors, the use of which, is herein after explained.

In use, the coils as shown, are positioned to have the units horizontal, in order that best results in heating the air and in handling the condensed water, may be obtained, Aalthough the coils will operate to heat in any position.'

lith the unit cavity 12 supplied by steam or vapor, all portions of the radiating walls as 7, 8, 9, 10 and 1l readily drain into the troughs of the leaves 2, 3 and 4- and thence to the drainage end into the drain pipe 23, as shown in Figures 1 and 2, or drain pipe 34, as shown in Figures 5 and 6. There being no hollow projections on any of the walls of the units, it is readily seen that no part of the radiating walls of the unit is curtained off by a dropping film of water and every part of these walls is exposed to j the heating medium directly connected with the main cavity containing the saine.

Considering the air circulation through the bank 21 of coil units l shown in Figures 1 and 2, where the bank is only one unit thick, air in traveling from left to right strikes the reversely curved walls 7, passes upward against the curved wall 10` and is deflected downward around the leaf 5 of the unit below. Striking the wall 9 of the under unit, it is deflect-ed around the leaf' 3 of the upper unit, striking the wall 11 of the upper unit where it is deflected around the leaf of the lower unit and passes out between the leaves 4 of the upper and lower adjoining units, forming the passage under consideration. The curved pieces 25 above and the channel 25a below connected with the housing, assist in guiding the air in a` sageway of air.

VIt is evident that so many'changes in the direction of the path of the air passing through the coil, must cause a mixing of the air passing, breaking up any tendency to stratification into layers of varying teinperature thoroughly saturating the air with heat giving the most freedom for radiation from the walls of the heating units on account of the movement oi ever changing air.

In the case of the bank 26 of heater coils shown in Figures 5 and 6, air passes into the compartment 28, of the housing 27 through the open shutter 32, thence itpasses through the lower six coils of the bank 26 of heater coils into compartment 29, where it rises and turns backward through the middle six coils of the said bank 26 into compartment 30; rising Vagain and passing forward, the air passes through the upper six coils of the bank 2G and out into the open compartment 31 froniwliich it passes into the rooin being heated. By this means just described, the air is re-heated twice on its way through the heater. Such an ar angeinent of` heating coils in a verticalbank, in conjunction vwith leading compartments, may be multiplied as 'desired for anynuinber of reheatings of air.

Various other modifications of iny invention may be made without departing from the spirit and scope thereof, therefore I do not wish to beliinited to the embodiments of my invention herein shown and described.

I claim:

1. In a heating coil, a horizontally disposed heating unit, said unit having a uniform cross section thruout its length, the inner contour of any ,sectionv being similar in shape and symmetrically positioned to the outer contour of said section, to have a radiating wall of uniform thickness thruout the extent of the unit, a plurality of' lon- `lower part of the said unit, there being a cylindrical arch between adjoining projections on the lower part of said unit.

2. In a heating coil, a plurality of heating units each similar in construction to the unit described in claim 1 and positioned relative to one another to be one above the other, to have the longitudinal projections of the upper unit occupy .spaces between the longitudinal projections on the upper part of the next lower unit, whereby air passing thru the space between the units passes in a broken line course. j

8. A heating device having a vertical bank of like heating coils, each of .said coils coin` prising a plurality of heating units, each of said units having a long hollow body, hollow leaves integral with said body, each run ning thelengtli thereof, said leaves being so arranged on said body that'in the coil, the leaves of adjoining bodies form defleeto'rsV to the passage ot air through said Coil, and a housing enveloping said bank of' coils for guiding the air repeatedly through sections of said bank of'coils.` i

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